Mix rice flour, urad dhal flour, butter, cumin seeds and salt and form a dough.
Take a lump of dough in your fist and using the fingers to push the dough out, form a rope-like pattern, shaping it into a spiral at the same time - you can use a circular board of the desired size as guide. Make five circles for a small spiral and nine circles for a big spiral.
Each time you run out of dough, take another lump of dough and start again, connecting one end with the other to form a continuous spiral.
Deep-fry the spirals in a wok of oil until golden brown on both sides.